cowles



'(Modell) 8. Bi cowLEs.

Chest Lock;

P a tented Feb. 8,-1881.

NPETERS. PNOTO-LITHOGRAPHER, WASHINGTONv D C.

UNITED STATES PATENT OFFICE.

GEORGE B. COWLES, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO P. 85 F. CORBIN, OF SAME PLACE.

CH EST- LOCK.

SPECIFICATION forming part of Letters Patent No. 237,492, dated February 8, 1881.

Application filed November 15, 1880. (Model) ried with the bolt and bears upon the edge of the case, and the end of which is protected by a vertical arm of the bolts, all in the manner hereinafter described.

The objects of my improvementare to make a look more durable and less liableto get out of order, and to so construct the parts that they may be produced at a very small cost.

I attain these objects by the simple construction illustrated in the accompanying drawings, in which Figure I is a front elevation, with the cap-plate removed and the bolt in an unlocked position. Fig. 2 is a like view, with the bolts imposition for locking. Fig. 3 is a vertical section on line :20 00 of Fig. 2.

Heretofore chest-locks having a double bolt, or what might be properly called one bolt with two books for engaging two staples, have had the end of the bolt forced downward toward the key by means of a spring, which was rigidly secured to the lock-case upon one side of the bolt, which spring had an arm which projected forward and rested upon a part of the bolt to hold it in a depressed position. These springs are quite expensive to manufacture, and are very liable to break and get out of order.

In the old style of bolt the case was so slotted upon one side and the bolts so constructed that when -the bolts were thrown forward in position for looking a portion of this arm was directly over the side 61 ot' the case. I first change theconstruction of this bolt, so that when it is thrown forward into the locking position, as'show'n in Fig. 2, this vertical arm a shall be wholly outsideof the side at of the case, whereby 1 am enabled to leave a small portion of said side 61, extending upward to form a spring-bearing stud, h.

In order to force the bolt downward I secure a flat wire spring, z', in a slot in the body of the bolt a, which spring is of such length that its free end, when depressed, will just work inside of the vertical arm 0 of the bolt and bear upon the stud h. This spring moves with the bolt, and has a constant tendency to depress it and hold it in either its looking or unlocking position. The vertical arm a prevents the spring from working endwise out of place.

I am aware that springs have been before secured in a slot so as to move with the bolt in chest-locks, which were termed single bolts, and which en gage with only one staple, and I hereby disclaim the same; but so far as I know no chest-lock having a double bolt for engagement with two staples has ever before been so constructed that this style of spring could be used in connection with it.

I claim as my invention- 7 The double bolt A a at, having the vertical arm 0, in combination with the spring 1 and the stud h, formed on the side d, all substan tially as described, and for the purpose speci- 

